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Use correctly-sized buffer when zero-filling a WAL file.

I mixed up BLCKSZ and XLOG_BLCKSZ when I changed the way the buffer isallocated a couple of weeks ago. With the default settings, they are both8k, but they can be changed at compile-time.

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src/backend/access/transam
- xlog.c

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`‎src/backend/access/transam/xlog.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -2289,7 +2289,7 @@ XLogFileInit(uint32 log, uint32 seg,`
`2289`	`2289`	`{`
`2290`	`2290`	`charpath[MAXPGPATH];`
`2291`	`2291`	`chartmppath[MAXPGPATH];`
`2292`		`-charzbuffer_raw[BLCKSZ+MAXIMUM_ALIGNOF];`
	`2292`	`+charzbuffer_raw[XLOG_BLCKSZ+MAXIMUM_ALIGNOF];`
`2293`	`2293`	`char*zbuffer;`
`2294`	`2294`	`uint32installed_log;`
`2295`	`2295`	`uint32installed_seg;`
`@@ -2351,7 +2351,7 @@ XLogFileInit(uint32 log, uint32 seg,`
`2351`	`2351`	`* cycles transferring data to the kernel.`
`2352`	`2352`	`*/`
`2353`	`2353`	`zbuffer= (char*)MAXALIGN(zbuffer_raw);`
`2354`		`-memset(zbuffer,0,BLCKSZ);`
	`2354`	`+memset(zbuffer,0,XLOG_BLCKSZ);`
`2355`	`2355`	`for (nbytes=0;nbytes<XLogSegSize;nbytes+=XLOG_BLCKSZ)`
`2356`	`2356`	`{`
`2357`	`2357`	`errno=0;`

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Commit79eb0eb

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`‎src/backend/access/transam/xlog.c`

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